/*
 * Copyright (C) 2014 fede
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.fede.digitalcontent.model;

import org.fede.util.Predicate;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 *
 * @author fede
 * @param <K>
 * @param <T>
 */
public abstract class BaseRepository<K, T> implements Repository<K, T> {

    private final Map<K, T> instances = new HashMap<>();

    @Override
    public final T findById(K id) {
        return this.instances.get(id);
    }

    @Override
    public final Set<T> findAll() {
        return new HashSet<>(this.instances.values());
    }

    @Override
    public final Set<T> filter(Predicate<T> predicate) {
        Set<T> answer = new HashSet<>();
        for (T t : this.instances.values()) {
            if (predicate.test(t)) {
                answer.add(t);
            }
        }
        return answer;
    }
    
    protected void add(K key, T entity){
        this.instances.put(key, entity);
    }
}
